Does it work with my Garmin watch?

Yes. Thermio connects directly to Connect IQ–compatible Garmin watches over Bluetooth — no phone needed. Add it as a data field to log real air temperature, humidity, and pressure into your activities, or use the glance widget to check conditions any time. If you miss the discontinued tempe, Thermio brings those readings back and adds humidity and pressure — note it works through Connect IQ (installed from the Connect IQ Store), not as a native temperature sensor.

When will Thermio ship?

Core sensors and the Garmin integration are validated, and beta trail testing is underway. Waitlist members get timeline updates and early access invites first.

What does joining the waitlist commit me to?

Nothing. No payment, no obligation. You’ll get product updates and first access to early inventory at the founder price (€59 Mini / €109 Thermio).

BEYOND THE FORECAST

The ultralight sensor that logs your overnight low

Temperature, humidity, and pressure from your exact camp — real readings, not the nearest weather station.

Get founder price + early access

Get launch updates, beta invites, and early access.

Logs your overnight lowCold-tested to −20°C9 g / 5 gFounder price from €59

Thermio ultralight temperature sensor (9 g) clipped to a backpack strap, showing real-time trail conditions on the reflective display

The forecast said 8 °C. On the ridge, it was −2. Weather stations sit in valleys — your trail doesn’t.

Forecasts guess. Watches overheat. Thermio measures.

The forecast

Based on valley stations, not your ridge.

The watch

Reads your 37 °C skin, not the air.

Thermio

Clips to your pack. Reads real conditions.

What Thermio helps you decide

Whether your sleeping bag stays dry

Dew point predicts condensation before it soaks your kit.

When weather is turning

Watch pressure trends where you are — before the forecast catches up.

What camp was actually like

Review real overnight lows and humidity from your exact site, not the town forecast.

Field-tested, not just imagined

Sensor accuracy validatedCold-tested to −20°CField-tested in alpine conditionsCompanion app with live readings, graphs, and CSV exportWorks with Garmin watches via Connect IQ (data field + widget)

On-device screen reading −2.6 °C, deep in the snow

Overnight lows on the screen at camp — no phone needed

Clipped to a pack, ready for the trail

Paired straight to the Garmin over Bluetooth

Clipped high on the pack, logging the whole climb

Two sensors. One mission.

Both sensors measure the same things, share the same app, and run around 2 years on a coin cell — the only differences are the display and the weight. Choose Thermio for a sunlight-readable display, or Thermio Mini for the lightest possible kit.

Thermio

With display

Sunlight-readable display for instant readings. Full graphs and exports in the app.

€129Founder price €109

Live temperature, humidity, and pressure, with on-device min/max
Dew point and wet-bulb temperature calculated automatically
Syncs to companion app via Bluetooth + Garmin via Connect IQ
Sunlight-readable display for instant readings
9 g target weight

Thermio Mini

Ultralight

All data in the app or on your Garmin. Just 5 grams on your pack.

€69Founder price €59

Same sensors as Thermio: temperature, humidity, and pressure, with on-device min/max
Dew point and wet-bulb temperature calculated automatically
Syncs to companion app via Bluetooth + Garmin via Connect IQ
No display — data via companion app or your Garmin watch
Just 5 g on a CR1632 coin cell

Waitlist members lock in the founder price — €59 Mini / €109 Thermio, first batch only.

Every reading. Every trend. One app.

The companion app connects to your sensor via Bluetooth, so you can check live readings and review trends from your trip.

Live ambient readings — temperature, humidity, and pressure from your sensor
Graphs and trends — your full history in one place
Dew point and wet-bulb — automatically calculated from your sensor’s readings
Free to use — no account, no ads, no in-app purchases

Companion app home screen showing live temperature, humidity, and pressure

Companion app condensation forecast showing the margin to the dew point and tonight's outlook

Companion app trends screen showing temperature, humidity, and pressure history

WORKS WITH GARMIN

Your conditions, on your Garmin watch

Thermio connects directly to your Garmin over Bluetooth — no phone needed on the trail. If you miss the discontinued tempe, it brings temperature back to your watch — plus humidity and pressure — through Connect IQ.

Thermio sensor clipped to a backpack while a Garmin watch shows live temperature, humidity, pressure, and dew point on the trail — Live temperature, humidity, pressure, and dew point on the watch — the sensor clipped to a pack, phone left behind.

Connect IQ data field

Add real air temperature, humidity, and pressure to any recorded activity — saved with your run or hike.

Glance widget

Check live conditions any time from the watch face, even when you're not recording an activity.

Direct over Bluetooth

The watch reads the sensor directly — works the same whether your phone is Android or iOS, or left in the tent.

Works with Connect IQ–compatible Garmin watches. Thermio runs through Connect IQ (a data field + widget) you install from the Connect IQ Store — not as a native temperature sensor. And where the tempe only logged temperature, Thermio adds humidity, pressure, dew point, and wet-bulb.

Back home, a Home Assistant integration (via HACS) is coming soon — pull your Thermio readings into your smart-home dashboard and history.

FAQ

Phones pull forecasts from distant weather stations — not your actual location. Watches measure skin temperature, not ambient air. Thermio clips to your pack and reads the conditions right where you are — and can send those real readings to your Garmin watch.

Get early access to Thermio

Join the waitlist for the founder price and beta invites.